Just thought of a few things - conserning this Shielded Cable for Operational Equipment Networks (LON Cables)!
Don't confuse "COM 3" or "COM 5" STP Cables with "CAT 3" or "CAT 5" Cables - they are two completely different Animals!
Most Building Automation Networks & LONs use "COM X" type Cable for the links between Equipment and Controllers.
On a (common/current) Siemens Control System, the Cabling between FLNs (Floor Level Network controller{s} ) and TECs (Terminal Equipment Controller{s} ), would be COM 5 STP, and connect to these devices via an RJ-11 or RJ-45 Modular Plug (some simply Terminate to Terminal Strips).
The "COM X" Cable is constructed as follows:
<OL TYPE=A>
[*] COM 3 is a single pair STP, with an overall foil shield and tinned drain cable,
which is roughly the same diameter as RG6 COAX,
[*] COM 5 is also a single pair STP, with overall foil shield and tinned drain, but is physically around ΒΌ the diameter of the COM 3 Cable.
</OL>
COM 5 Cable is used on faster LONs, and has a much higher twist ratio.
Just wanted to mention this!
Scott35
BTW:
When I saw "Siemens", the name triggered this thought!
